Finra Upgrades Surveillance

WASHINGTON—Wall Street's self-regulator, in an effort to catch up with a boom in computer-driven trading, is extending its oversight to two stock exchanges catering to high-speed traders and taking a deeper look at "dark pools" that lure investors away from the public market, the watchdog's chief said.

The moves by the Financial Industry Regulatory Authority are an attempt to keep pace with rapidly changing markets and...